I regretted going 7 gal fabric on my first run even though I was trying for big plants. I found one problem was just too much wet media in the tent at any given time. That plus a lot of foliage = rh nightmare. Im trying 3 gals currently.
Solo cups just leave you no room for errors. Every thing has to be just right with ph/ec and perfect watering because they are going to basically live most of life root bound. Im doing a solo cup experiment recently too because of an awesome thread on here but I just started. Trying something either crazy or genius idk we'll see haha
Yup you have to be on point with solo cup grows, ph'ing isn't difficult, I'm sure people here, do it all the time.
I'll let you in on a secret..... coco with perlite or seramis (1 part perlite or seramis to 3 parts coco) then use coco specific nutes keep around 5.8pH.
Coco is far the best substrate to use for solo cups, you will get a much smaller yield from soil grow solo cups!
Never let coco dry out completely, it is a hydroponic substrate,it might look like soil but it is not!
Letting dry out completely will stress the plant and cause a pH fluctuation.
Don't you guy's have a solo cup challenge or competition?
For smaller strains in veg once a day feeding is cool, in flower twice daily, for really tall plants wake up - water, have lunch - water, mid afternoon pee - water ad infinitum throughout the day, they will take up and transpire a fair bit of nutes through the day and the solo cup is nearly all roots, so it holds very little nutes.